What is the mass in grams of 557 copper atoms?

Question

Quizplus · Accepted Answer

First, we need to find the molar mass of copper. The atomic mass of copper is 63.55 g/mol, so one mole of copper atoms weighs 63.55 g. To convert to grams per atom, we divide by Avogadro's number:

63.55 g/mol / 6.022 x 10^23 atoms/mol = 1.055 x 10^-22 g/atom

To find the mass of 557 copper atoms, we multiply 1.055 x 10^-22 g/atom by 557 atoms:

1.055 x 10^-22 g/atom x 557 atoms = 5.88 x 10^-20 g

Therefore, the mass in grams of 557 copper atoms is 5.88×10^-20 g, which is answer choice B.

What Is the Mass in Grams of 557 Copper Atoms